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Photons Energy Level

  1. May 14, 2008 #1

    Air

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    I understand that electrons are excited to higher energy levels. When they fall back levels, photons are emitted.

    If green light has wavelength [itex]5.58 \times 10^{-7}m[/itex] and red light has wavelength of [itex]6.48 \times 10^{-7}m[/itex], why is it that when a photon is emitted from green light, it falls a greater energy level?
     
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  3. May 14, 2008 #2

    Mapes

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    What is the relationship between energy and wavelength for electromagnetic waves?
     
  4. May 15, 2008 #3

    Air

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    [itex]v = f \lambda [/itex]
    [itex]E = hf = \frac{hv}{\lambda}[/itex]

    So green light has a smaller wavelength hence a larger value of energy. Is this why it falls a greater energy level?
     
  5. May 15, 2008 #4

    Defennder

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    Yes, that is so.
     
  6. May 15, 2008 #5
    so... if E=hf, green light have more energy than red light?
     
  7. May 15, 2008 #6

    Defennder

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    Yes, but that energy is per photon.
     
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